Flywheel



FLYWHEEL JVC. BOHMKER Filed April 2 I Patented June 29, 1926.

UNITED STATES JOHN o. normanna; or xnnxnxnn, ILLINOIS',Y Y.assicurer Tosanas; nonstick. AND

oo., or CHICAGO, ILLINoIs; A CORPORATION' orA NEW YORK...

FLYVVHEEL.

Application led. April 2:, 1925. Sera1No1-20g09'Z.

r1`his invention relates to fly Wheels for mowers, reapers or likemachines, and more venting` excessive' Wear..

inV oiling7 the bearing adequately and pref @ne object of this inventionis to provide an oilging system. whereby' the oil is more effectivelyfed tothe bearing..

Another object is to provide an'oil chamber' of a'chara'cter' such as tocause oil to flow by centrifugal force to the pitman bearfurtherv objectis' to provide ani-mproved inea-ns to`A take-up the bearing tocompensate forwear.

In. thel accompanying drawings Figure it is a view ofthe outer side Vofthe fly Wheel.

Fig. 2 is a sectional view inf. the plane of line 2 2 of Fig. 1 lookingiii the" direction of the arrows.

Fig. 3 isaf perspective viev/v of the4 bearing' sleeve.

Fig. 4 is a view in the plane of line 4 4 of Fig; 2 looking ini thedirection of the arrows.V Y

Fig.A 5 is a view in the plane of line 5-5 of Fig. 2 looking in thedirection of the arrows'. y

Referring to the accompanying drawings, the fly Wheel 1 ist externallyof the type usually incorporated mowers, reapers and like machines'Y it'VVbeing herein `shown as keyed" on a shaft 2.

A; Wrist or crank pin 3 is positioned eccentricall'y on the outer sideof' the fly 'Wheel 1 and secured theretovby' any suitable means.

In vthe" present insta-nceV it has al screwthr'eaded portion 4 enga-ginga correspondringly threaded hole 5` in the Wheel'.

The fly Wh'eei is cored out' to pro-vide therein an oil chamber 6encircling the sha-ft and of' such shape as to*v provide adjacent thecrank pin 3 a recessf disposed! a greater distance from the center' ofvsaid fly Wheel than is any other portion of the oil chamber.V Thus' Whenthe tiy Wheel is rotating normally, oil contained? in the chamber islcaused to` flow into' the recess by centrifugal force, so' as tomaintain a supply of oil for the pitman bearing on the ycra-n ki pin aslong as there'- is any foil' remaining in the oi-l` chamber- Forconducting the oilC tov the crank pin', the pin is boredto.l form an.oil duct. 8 Which connects with the recess 7.4 Said oil.Y duct comprisesa longitudinal. axial portion 9` and a radi-al portion t0 which ter--minates in. a circumferential distributing groove 11 in the: crank pin.

The pitman bearing comprises. a bearing. sleeve 132 of suitablemateria-l, herein shown. as being' split longitudinally asat 13x. This`sleeve is housed inf a longitudinally slit box. 14 on'the end of a crankarmor pitman. 1.5. and is prevented from turning in said. box by a lug:16 engaging' a correspondingly shaped notch 17 inthe pitma-n box.. Thepitman box is retained on the. crank pin and oil prevented from leakingfrom the bearing by suitable mea-ns suchf as a. cap nut 18? engaging acorrespondingly threaded portion 19 of the' crank and, fitting tight-vly' against a shoulder 20 on" said' crank pin. A Wide' groove inside thepitmanbox forms in conjunction With the sleeve anv arcuate reservoir 21.This; groove terminates at opposite ends short of the slit 22. in'jthepit man boxv (Fig. the parts' being' hel-df in this relation by theinterengagingjlug 16 andi notch 17S Holes such as23` in. thev sleevepermit excess oily at the bearing surface to flow into said` reservoir.

Suitable means to perm-it fill-ingL of vthe oil chamber may be provided,such as an openingnorma-lly closed' by ascrevv plug 24.

From the foregoing it will readily be seen that. when the flywheel isrotating the oil vforced byl centrifugal pressure into the recess of theoil chamber continues through the duct of the crank pin intothecircumferential groove and thence distributes over the surface of thepitman bearing.. Excess oil fed to the distributing groove of the crankpin suchi as might be. experienced due tothe higher centrifugal pressurewhen the oil chamber has been freshly filled may pass through theV holes23 into- -the reservoir. s theY oil supply in th-e oil chamberdiminish-es .and the pressureV at thebearing correspondii'iglydecreases, they oil in the reservoir flow back into the distributinggroove and thence to the bea-ring surface to help lubricate the bearing.Bfy this means the excess oil present at the bearing surface because' ofabnormal oil pressure,v is collected in the auxiliary 'reservoir andthereby conserved until the oil pressure decreases.

The construction of the sleeve 12 is such as will permit take-up of thebearing to compensate for wear. This assists in the efficientlubrication of the bearing by preventing leakage of the oil such aswould be experienced with a loose bearing.

To accomplish the take-up the pitman box 14: is provided with a pair oflugs 25 as shown in Figs. 1, 2 and 4, one on each side of thelongitudinal slit 22. Suitable means such as a cap screw 26 is providedto draw th-e lugs 25 together. This action contracts the pitman box andthereby the sleeve 12 around the crank pin to take-up the bearing.

The width of the slit 13 in the bearing sleeve 12 may be equal to thethickness of said bearing sleeve and thereby permit takeup to the extentof one-half the thickness of the said sleeve. After this amount of'take-up the bearing sleeve may be replaced.

To provide for accurate adjustment of the bearing and to retain thatadjustmentduring the operation of the machine the cap screw 26 may havediametrical holes 27 at right angles to each other. either of said holesadmitting a cotter pin 28. When a cotter pin is inserted in one of theholes the head of the cotter pin bears against a shoulder 29 on thepitman box 14 and prevents the cap screw 26 from turning. By this meanstake-up to the accuracy of one quarter turn of the cap screw isobtainable.

It will be seen that I have combined in a Hy wheel having a crank pinassociated therewith, a positive and effective oil feeding systemtogether with effective means for conserving the oil and using itefficiently. Thus a long life for the bearing is insured and theannoyance and expense heretofore experienced eH'ectually overcome.

While one embodiment of my invention has been selected for purposes ofillustration, it is understood that various modifications may be madewithout departing from the scope of the following claims.

I claim as my invention:

1. In combination, a Hy wheel having an oil reservoir with an outletfrom which oil is fed by centrifugal force, a crank pin on the fly wheeladjacent said outlet, a split bearing sleeve on said crank pin, a pitmanbox housing said bearing sleeve and holding said sleeve against turningtherein, said pitman Vloox having a groove forming with the sleeve anarcuate reservoir partly around said sleeve, said sleeve and said crankpin having ducts therein communicating from the reservoir of saidhousing to the said outlet of the oil reservoir in the Hy wheel, andmeans to retain said sleeve and box in position and to prevent oilleakage.

2. In combination. a mower Hy wheel, a crank pin mounted eccentricallyon said Hy wheel, a sleeve on said crank pin, means to feed oil to thebearing surface of said crank pin, and a pitman box housing said sleeve,said pitman box having a groove forming with the sleeve a reservoir,said sleeve having a duct leading from said bearing surface to saidreservoir whereby excess oil may How into said reservoir.

3. In combination, a Hy wheel having an oil reservoir with an outletremote` from the axis of rotation of the wheel wherefrom oil is fed bycentrifugal force, a crank pin on said fly wheel adjacent said outlet, abearing sleeve on said crank pin, a pitman box housing said bearingsleeve, said pitman box hav ing a groove in its inner side forming withthe sleeve an auxiliary oil reservoir, said crank pin having alductestablishing communication between the bearing surface. of said crankpin and the outlet of said Hrst mentioned reservoir and said sleevehaving a duct communicating from said bearing surface to said auxiliaryreservoir whereby excess oil may How into said auxiliary reserv voir.

4. In combination, a mower Hy wheel having an internal oil reservoirencircling the axis of rotation, said oil reservoir having a recess atone point in its peripheral wall and being of such form that said recessis more remote from the axis of the wheel than is any other part of theoil reservoir, a crank pin mounted on said Hy wheel adjacent saidrecess` said crank pin having an oil Vduct establishing communicationbetween said recess and the bearingsurface of the crank pin.

5. In combination, a Hy wheel having an oil reservoir associatedtherewith for rotation with the Hy wheel said reservoir having an outletremote from the axis of the wheel, a crank pin on said Hy wheel adjacentsaid outlet, said crank pin having a duct leading from the outlet of thereservoir to the bearing surface of said crank pin, a split sleeve onsaid crank pin, a longitudinally slit box housing said sleeve, said boxhaving two radially projecting lugs one on each side of the slit, andmeans adapted to draw the lugs together thereby contracting said sleeveon said crank pin, and means on said crank pin to retain said sleeve andbox in position and to prevent oil leakage.

6. In combination, a mower Hy wheel, a crank pin mounted eccentricallyon said Hy Wheel, a split sleeve on said crank pin, means to feed oil tothe wearing surface of said crank pin, a pitman box housing said sleeve,said pitman box having a groove on the inner side forming with saidsleeve an arcuate oil reservoir, means holding the sleeve againstturning, said sleeve having a duct leading from the bearing surface ofsaid crank pin to said reservoir, means to contract said sleeve on saidcrank pin and means to retain said sleeve and pitman boX means tocontract said sleeve on said crank in position and to prevent oilleakage. pin, and means to retain said sleeve and pit- 10 7. Incombination, a mower ily Wheel, a man box in position and to prevent'oilleakcrank pin mounted eccentrically on said I'ly age.

5 Wheel, a split sleeve on said crank pin, means In testimony whereof Ihave hereunto to feed oil to the Wearing surface of said affixed mysignature. crank pin, a pitman box housing said sleeve, means holdingthe sleeve against turning, JOHN C. BOHMKER.

